What is Popcorn Lung? Popcorn Lung is a serious, permanent lung disease caused by inhaling harmful chemicals like diacetyl, sometimes found in flavored vapes. Tips for Parents & Caregivers: Talk Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Popcorn lung: What is it, and who is at risk? Harvard Health What is the Link Between Popcorn Lung and Vaping? The Dunken Law Firm E cigarettes can result in 'Popcorn Lung' Does vaping cause lung cancer? UT MD Anderson